81377920
81,377,920 is an even composite number composed of four prime numbers multiplied together.
81377920 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixty-four divisors.
Prime factorization of 81377920:
27 × 5 × 13 × 9781
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 13 × 9781)See below for interesting mathematical facts about the number 81377920 from the Numbermatics database.
Names of 81377920
- Cardinal: 81377920 can be written as Eighty-one million, three hundred seventy-seven thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 8.137792 × 107
Factors of 81377920
Divisors of 81377920
- Number of divisors d(n): 64
-
Complete list of divisors:
1 2 4 5 8 10 13 16 20 26 32 40 52 64 65 80 104 128 130 160 208 260 320 416 520 640 832 1040 1664 2080 4160 8320 9781 19562 39124 48905 78248 97810 127153 156496 195620 254306 312992 391240 508612 625984 635765 782480 1017224 1251968 1271530 1564960 2034448 2543060 3129920 4068896 5086120 6259840 8137792 10172240 16275584 20344480 40688960 81377920
- Sum of all divisors σ(n): 209530440
- Sum of proper divisors (its aliquot sum) s(n): 128152520
- 81377920 is an abundant number, because the sum of its proper divisors (128152520) is greater than itself. Its abundance is 46774600
Bases of 81377920
- Binary: 1001101100110111010100000002
- Hexadecimal: 0x4D9BA80
- Base-36: 1CG7LS
Squares and roots of 81377920
- 81377920 squared (813779202) is 6622365863526400
- 81377920 cubed (813779203) is 538914359452782297088000
-
The
square root of 81377920 is 9020.9711228891 -
The
cube root of 81377920 is 433.3467346283
Scales and comparisons
How big is 81377920?- 81,377,920 seconds is equal to 2 years, 30 weeks, 3 days, 20 hours, 58 minutes, 40 seconds.
-
To count from 1 to 81,377,920 would take you about three years!
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 81377920 cubic inches would be around 36.1 feet tall.
Recreational maths with 81377920
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